Russian contralto and vocal teacher (b. 25 December 1829/6 January 1830 in Saint Petersburg; d. 11/24 May 1903 in Saint Petersburg), born Anna Karlovna Frideburg (Анна Карловна Фридебург); known after her marriage as Anna Leszetyckaja-Frideburg (Анна Лешетицкая-Фридебург), or Anna Leszetycki.
In 1856 she became the first wife of the Polish pianist, teacher and composer Teodor Leszetycki (1830–1915). They divorced in 1878.
Correspondence with Tchaikovsky
One letter from Tchaikovsky to Anna Frideburg has survived, dating from 1889, and has been translated into English on this website: